Stock Options, Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Unamortized Stock Compensation Expense [Abstract]
Unamortized stock compensation expense | $	$ 9,846,902
Period for recognition	1 year 6 months 22 days
The Plans [Member] | Stock Options [Member]
Number of Shares [Roll Forward]
Options outstanding, beginning balance (in shares)	2,445,713
Granted (in shares)	1,822,609
Exercised (in shares)	0
Forfeited (in shares)	(30,640)
Expirations (in shares)	(10,660)
Options outstanding, ending balance (in shares)	4,227,022
Vested and expected to vest (in shares)	4,121,868
Exercisable (in shares)	1,799,999
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 3.13
Granted (in dollars per share) | $ / shares	7.56
Exercised (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	7.98
Expirations (in dollars per share) | $ / shares	8.28
Options outstanding, ending balance (in dollars per share) | $ / shares	5.00
Vested and expected to vest (in dollars per share) | $ / shares	4.94
Exercisable (in dollars per share) | $ / shares	$ 2.94
Remaining Contractual Life and Aggregate Intrinsic Value [Abstract]
Options outstanding, weighted average remaining contractual life	8 years 4 months 10 days
Options outstanding, aggregate intrinsic value | $	$ 25,377,366
Vested and expected to vest, weighted average contractual life	8 years 3 months 29 days
Vested and expected to vest, aggregate intrinsic value | $	$ 24,969,093
Exercisable, weighted average contractual life	7 years 3 months 25 days
Exercisable, aggregate intrinsic value | $	$ 14,501,041